Improvement



R. COOK.

Blast F urnace Patented Mar. 26,1850.

AM. PHOTD'LITHO.CO.N.Y. (DSBDRNE'S PROCESS.)

rrn

RANSOM COOK, OF SARATOGA SPRINGS, NEWV YORK.

IMPROVEMENT IN BLAST-PIPES FOR CONVEYING HEATED AIR AND GASES TO FURNACES.

. To all whom it may concern.-

Be it known that I, RANsoM 0001;, of the town of Saratoga Springs, county of Saratoga, and State of New York, have invented a new and Improved Tuyere or Blast-Pipe; and I hereby declare that the following is a full and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification.

The nature of my invention consists in. a

mode of partially arresting and returning to furnace. A is the heating-oven.v B is the gas chamber, where the escaping products of combustion are gathered and partially arrested in their progress to the chimney. O is the fine or commencement of the chimney. D is a stop-cock. E is the smaller or interior pipe of the tuyere, connected with the ga schamher. F is the external. pipe of this tuyere, in the upper end of which theblast enters.

Fig. 2 is a representation of this tuyere as disconnected from the heating-oven. A blast of air entering either of these pipes at the end where they branch or separate will create a draft through the other pipe, moving in the same direction as the blast and discharging through the orifice common to both pipes. \Vhen, therefore, this tuyere is attached to the heating-oven, as shown in Fig. 1, the blast cn- Specification forming part of Letters Patent No. 7,2HL dated March 26, 1850.

tering at the pipe F will, in passing over the end of the pipe E, create a partial vacuum at its lower orifice, causing a draft through the pipe E, and in this way the smoke and other products of combustion will be drawn from the gas-chamber, and, mingling with the atmosphere of the blast, will be returned to the fire-box of the heating-oven. As these arrested gases, mixed with fresh oxygen, are made to enter the fire-box beneath the grate, they must subsequently pass through the fire and be thoroughly exposed to combustion.

Fig. 3 is a sectional view of this double tuyere, the upper half of theexterior pipe-being removed. The contraction of the outer pipe close to the end of the inner one, as shown in this figure, is adopted for the purpose of creating a draft through the interior pipe with the use of a much less volume of air in the blast than would be otherwise required.

I do not claim the'discovery of this method of creating a partial vacuum or draft through one pipe or aperture by the rapidmovement of a fluid in another pipe with which the first is connected, havingits mouth or orifice in contact with the fluid in motion; but

That I claim as my invention applicable to heating and smelting operations, and which I lVitnesses:

T. P. BROWN, SAML. TEN EYoK. 

